CN204438081U - Extra-supercritical unit, extra-supercritical unit water-cooling wall - Google Patents
Extra-supercritical unit, extra-supercritical unit water-cooling wall Download PDFInfo
- Publication number
- CN204438081U CN204438081U CN201520010543.1U CN201520010543U CN204438081U CN 204438081 U CN204438081 U CN 204438081U CN 201520010543 U CN201520010543 U CN 201520010543U CN 204438081 U CN204438081 U CN 204438081U
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- China
- Prior art keywords
- water
- extra
- cooling wall
- supercritical unit
- overcoat
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- 238000001816 cooling Methods 0.000 title claims abstract description 60
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 230000007797 corrosion Effects 0.000 claims abstract description 15
- 238000005260 corrosion Methods 0.000 claims abstract description 15
- 230000003647 oxidation Effects 0.000 claims abstract description 10
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 10
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 229910018487 Ni—Cr Inorganic materials 0.000 claims description 5
- 239000011651 chromium Substances 0.000 claims description 5
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 claims description 5
- 229910001120 nichrome Inorganic materials 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 9
- 230000007774 longterm Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 11
- 238000007789 sealing Methods 0.000 description 10
- 239000003795 chemical substances by application Substances 0.000 description 7
- 230000035882 stress Effects 0.000 description 5
- 230000001680 brushing effect Effects 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 238000009659 non-destructive testing Methods 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 231100000078 corrosiveness Toxicity 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007761 roller coating Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000007592 spray painting technique Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Coating By Spraying Or Casting (AREA)
Abstract
The utility model discloses a kind of extra-supercritical unit, extra-supercritical unit water-cooling wall.This extra-supercritical unit water-cooling wall comprises multiple water screen tube be arranged side by side, and the outer surface of the tube wall (2) of this water screen tube is provided with the overcoat (1) with high temperature oxidation resistance, corrosion resistance and wearability.By being arranged on the overcoat (1) on water-cooling wall, effectively prevent the thermal-flame in burner hearth, reducibility gas and high speed ejecta to the heat exchange stress of extra-supercritical unit water-cooling wall, corrosion and effect of impact, prevent the generation of transversal crack, the water-cooling wall that the utility model is provided can be applicable in extra-supercritical unit for a long time, guarantees that whole unit long-term safety is run.
Description
Technical field
The utility model relates to heat-engine plant boiler system, particularly, relates to a kind of extra-supercritical unit, extra-supercritical unit water-cooling wall.
Background technology
Because the extra-supercritical unit thermal efficiency is very high, therefore it is more and more extensive in the application of thermal power plant.In boiler, water-cooling wall is absolutely necessary unit, and it is the main heated portion of boiler, the even more heat of 40% ~ 50% in absorption boiler.Water-cooling wall is rearranged by multiple steel pipe, is arranged on the surrounding of boiler furnace.Water-cooling wall, by the water that flows in tube chamber and steam, absorb the thermal-flame in the outside burner hearth of tube wall and gas radiation heat, and the water in tube chamber becomes steam, thus reduces temperature of furnace wall and protect furnace wall.
But, large in extra-supercritical unit chamber structure size, structural stress is large, the sub-service temperature of water screen tube itself is higher, in the region that thermic load is higher, because of boiler flame burning unstability, frequent starting and stopping boiler and often carry out the combined causes such as peak regulation, the temperature fluctuation of water-cooling wall tube wall is larger, easy generation alternating thermal stress, under the acting in conjunction of structural stress, welding residual stress, in the course of time the easy region higher in thermic load, water screen tube sub-surface produces transversal crack.In addition, again because the pernicious gas such as sulphur of burner ejection and boiler adherent on reducing gas, high temperature corrosion effect is produced to water-cooling wall, the high speed ejecta of burner ejection has effect of impact to water-cooling wall, these corrosivenesses and effect of impact accelerate the expansion of transversal crack, finally cause water-cooling wall cruelly to leak, even power plant needs maintenance of stopping transport.Traditional solution carries out grinding process or replace tubes to transversal crack region, but water-cooling wall safe operation in the short time can only be ensured, during boiler longtime running, the tube wall of water-cooling wall there will be transversal crack again, and, reduce water-cooling wall pipe strength after polishing certain depth, and replace tubes needs certain duration, cost is also comparatively large, and can not tackle the problem at its root.
Therefore, the art needs a kind of extra-supercritical unit water-cooling wall can eliminating the transversal crack that water-cooling wall produces for a long time.
Utility model content
The purpose of this utility model is to provide a kind of water-cooling wall that can be applicable to extra-supercritical unit operating mode for a long time.
To achieve these goals, the utility model provides a kind of extra-supercritical unit water-cooling wall, comprise multiple water screen tube be arranged side by side, wherein, the outer surface of the tube wall of described water screen tube is provided with the overcoat with high temperature oxidation resistance, corrosion resistance and wearability.
Preferably, described overcoat is laid on the outer surface of the tube wall of described water screen tube equably.
Preferably, described overcoat is Cr
3c
2-NiCr nickel chromium triangle coating.
Preferably, the thickness of described overcoat is 0.4-0.6mm.
The utility model also provides a kind of extra-supercritical unit, and wherein, this extra-supercritical unit comprises the extra-supercritical unit water-cooling wall that the utility model provides.
By extra-supercritical unit water-cooling wall of the present utility model, the outer surface of the tube wall of the water-cooling wall of generation transversal crack is arranged there is high temperature oxidation resistance, the overcoat of corrosion resistance and wearability, thus effectively prevent the thermal-flame in burner hearth, reducibility gas and high speed ejecta are to the heat exchange stress of extra-supercritical unit water-cooling wall, corrosion and effect of impact, prevent the generation of transversal crack, the water-cooling wall that the utility model is provided can be applicable in the extra-supercritical unit of HTHP operation for a long time, guarantee that whole unit long-term safety is run.
Other features and advantages of the utility model are described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide further understanding of the present utility model, and forms a part for description, is used from explanation the utility model, but does not form restriction of the present utility model with detailed description of the invention one below.In the accompanying drawings:
Fig. 1 is the Longitudinal cross section schematic of the ultra supercritical water-cooling wall of detailed description of the invention of the present utility model.
Description of reference numerals:
1 overcoat; 2 tube walls.
Detailed description of the invention
Below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is described in detail.Should be understood that, detailed description of the invention described herein, only for instruction and explanation of the utility model, is not limited to the utility model.
The utility model provides a kind of extra-supercritical unit water-cooling wall, and this water-cooling wall comprises multiple water screen tube be arranged side by side, and the outer surface of the tube wall 2 of this water screen tube is provided with the overcoat 1 with high temperature oxidation resistance, corrosion resistance and wearability.By this overcoat 1, the effect of impact of the high speed ejecta in burner can be stopped, reduce thermal-flame in burner hearth and reducibility gas to the high temperature corrosion effect of extra-supercritical unit water-cooling wall, thus effectively reduce the generation of transversal crack.
In the process that described overcoat 1 is set, preferably lay overcoat 1 equably, make water screen tube entirety all be subject to the protection of overcoat 1.
The material of described overcoat 1 can select the coating in the art with high temperature oxidation resistance, corrosion resistance and wearability, such as FeCrNi alloy coat or FeCrAl alloy coat, but as preferred embodiment of the present utility model, overcoat 1 have employed Cr
3c
2-NiCr nickel chromium triangle coating, is laid on the Cr on water screen tube surface
3c
2-NiCr nickel chromium triangle coating is because of its high temperature oxidation resistance, ensure that the tube wall temperature of water-cooling wall can not fluctuate widely, in addition because of its corrosion resistance and wearability, make the impact of the reducing atmosphere in water-cooling wall and burner hearth and burner ejecta isolated, eliminate all factors causing water screen tube produces transversal crack.
In addition, the thickness of this overcoat 1 is unsuitable blocked up, also should not be excessively thin, when overcoat 1 is crossed thin, the protection life-span of overcoat 1 declines, when overcoat 1 is blocked up, prevent the effect of transversal crack bad, therefore, as preferred embodiment of the present utility model, can be arranged between 0.4-0.6mm, more preferably, be set to 0.5mm, now this overcoat 1 can prevent the generation of transversal crack effectively, can ensure extended protection water-cooling wall again.
The utility model also provides a kind of extra-supercritical unit, this extra-supercritical unit comprises the extra-supercritical unit water-cooling wall that the utility model provides, because the overcoat 1 on this water-cooling wall can prevent the generation of transversal crack, make this extra-supercritical unit can safe operation for a long time.
A kind of means of defence of extra-supercritical unit water-cooling wall is also provided in the utility model; the method comprises: step a, to arrange have the overcoat 1 of high temperature oxidation resistance, corrosion resistance and wearability at the outer surface of the tube wall 2 of water screen tube; in order to water-cooling wall can be protected all sidedly, preferably overcoat 1 is laid on the outer surface of tube wall 2 of water-cooling wall equably.
In addition, in described step a, the method that the outer surface of the tube wall 2 of described water-cooling wall arranges described overcoat 1 can have the multiple methods such as spraying, brushing, roller coating, but the water-cooling wall in boiler is more, the laying area of overcoat 1 is large, therefore the utility model utilizes electric arc to spray this overcoat 1 on the tube wall 2 of water-cooling wall, but the utility model does not limit the method arranging this overcoat 1, does not limit Spray painting tool yet.
Further, have employed high temperature oxidation resistance, corrosion resistance and wearability Cr all preferably in the utility model
3c
2-NiCr nickel chromium triangle coating, as overcoat 1, can prevent the generation of the transversal crack on water-cooling wall effectively.
Before the outer surface of the tube wall of water screen tube arranges overcoat 1, the means of defence of extra-supercritical unit water-cooling wall of the present utility model can also comprise step b part water-cooling wall producing transversal crack being carried out to grinding process, make the surface cleaning of water screen tube after polishing, drying and even, expose metallic luster.
In addition, the step c utilizing magnetic to carry out Non-Destructive Testing can also be comprised between step a and step b, when detected on described water-cooling wall tube wall by step c there is magnetic trace time, show that this region also exists transversal crack, after now removing magnetic, continue to polish to this region, until the magnetic particle indications that this region does not occur; When there is not magnetic trace, showing that this region does not have transversal crack, grinding process can be terminated and carry out step a.
Because the overcoat 1 after spraying is for there being the coating of pore structure, therefore in order to avoid corrosive deposit passing hole penetrates on the tube wall 2 of water-cooling wall, also comprise after step a and utilize hole sealing agent to carry out the steps d of sealing of hole to the micropore on described overcoat 1, and hole sealing agent can adopt inorganic sealing hole agent, the utility model have employed the conventional silicate hole sealing agent of the art.
In addition, coat hole sealing agent by the mode of brushing on the surface of described overcoat 1, the mode of brushing can avoid hole sealing agent to penetrate into tube wall water-cooling wall corroding water-cooling wall.
In above operation, the thickness of overcoat 1 is preferably 0.4-0.6mm, makes this overcoat 1 effectively can prevent the generation of transversal crack, does not affect again the heat transmission function of water-cooling wall.
By above-mentioned preferred embodiment, first grinding process is carried out to the transversal crack that extra-supercritical unit water-cooling wall produces, when confirming water-cooling wall there is no crackle by Non-Destructive Testing, region spraying after polishing has the overcoat of high temperature oxidation resistance, corrosion resistance and wearability, finally adopts hole sealing agent to carry out sealing pores.Be sprayed on the overcoat on the water-cooling wall after grinding process, effectively prevent the thermal-flame in burner hearth, reducibility gas and high speed ejecta to the heat exchange stress of extra-supercritical unit water-cooling wall, corrosion and effect of impact, thus prevent the generation of transversal crack, the water-cooling wall that the utility model is provided can be applicable to, in the extra-supercritical unit of HTHP operation, guarantee that whole unit long-term safety is run for a long time.
It should be noted that, the concrete technical operation mentioned in detailed description of the invention in the utility model, the technology that method as polishing, Non-Destructive Testing, sealing of hole operation and brushing, spraying is known to the skilled person, therefore, is not described in detail in the utility model.In addition, each the concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, can be combined by any suitable mode.
Below preferred embodiment of the present utility model is described by reference to the accompanying drawings in detail; but; the utility model is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present utility model; can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection domain of the present utility model.
Claims (5)
1. an extra-supercritical unit water-cooling wall, comprise multiple water screen tube be arranged side by side, it is characterized in that, the outer surface of the tube wall (2) of described water screen tube is provided with the overcoat (1) with high temperature oxidation resistance, corrosion resistance and wearability.
2. extra-supercritical unit water-cooling wall according to claim 1, is characterized in that, described overcoat (1) is laid on the outer surface of tube wall (2) of described water screen tube equably.
3. extra-supercritical unit water-cooling wall according to claim 2, is characterized in that, described overcoat (1) is Cr
3c
2-NiCr nickel chromium triangle coating.
4. extra-supercritical unit water-cooling wall as claimed in any of claims 1 to 3, is characterized in that, the thickness of described overcoat (1) is 0.4-0.6mm.
5. an extra-supercritical unit, is characterized in that, this extra-supercritical unit comprises the extra-supercritical unit water-cooling wall in claim 1-4 described in any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520010543.1U CN204438081U (en) | 2015-01-07 | 2015-01-07 | Extra-supercritical unit, extra-supercritical unit water-cooling wall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520010543.1U CN204438081U (en) | 2015-01-07 | 2015-01-07 | Extra-supercritical unit, extra-supercritical unit water-cooling wall |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204438081U true CN204438081U (en) | 2015-07-01 |
Family
ID=53605944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520010543.1U Active CN204438081U (en) | 2015-01-07 | 2015-01-07 | Extra-supercritical unit, extra-supercritical unit water-cooling wall |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204438081U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104566325A (en) * | 2015-01-07 | 2015-04-29 | 中国神华能源股份有限公司 | Ultra-supercritical unit, water wall of ultra-supercritical unit and protection method of water wall |
| CN106439774A (en) * | 2016-10-31 | 2017-02-22 | 江苏大唐国际吕四港发电有限责任公司 | Method for decreasing occurrence rate of transverse cracks of boiler water walls |
-
2015
- 2015-01-07 CN CN201520010543.1U patent/CN204438081U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104566325A (en) * | 2015-01-07 | 2015-04-29 | 中国神华能源股份有限公司 | Ultra-supercritical unit, water wall of ultra-supercritical unit and protection method of water wall |
| CN106439774A (en) * | 2016-10-31 | 2017-02-22 | 江苏大唐国际吕四港发电有限责任公司 | Method for decreasing occurrence rate of transverse cracks of boiler water walls |
| CN106439774B (en) * | 2016-10-31 | 2019-06-14 | 江苏大唐国际吕四港发电有限责任公司 | A method of it reducing boiler water wall transversal crack and occurs |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |